I have no idea. I think its a scam trying to scare people out of money. If my memory serves me correctly, by law they have to identify their name and the company they are calling from. These people did neither.
Since this appears to be a fairly new list, I assume it is for Scammers-in-Training. They probably still wet the bed at night. They eat Kowdunga for breakfast. (Kowdunga is a colloquial term for sacred, white cow shφ.) But you should do for them what I do for real professional scammers. Never answer the phone even if it shows your area code. (My answering machine does ask for a message to be left, but they never leave a live one.) Never call back because that could cost you money and/or tells them when you are home. Block the number. Get yourself a Panasonic phone system that blocks 250 numbers. A system with 3 handsets is about $100. Check Amazon.com for one. A nice feature is when the àѕѕηθļєs call back, there is no ring to irritate you. We are a sick society if we keep on accepting these insulting intrusions.